GeezerVisonThe World Wide Web, restored to 800 pixels of glory. |
| Home|About|Gaming cabinet|Archives|How it works|Starter sites |
GeezerVison is showing github.com — cpython/Python/ast.c at 3.8 · python/cpython Expand file tree/ Copy pathast.cMore file actions 6008 lines (5472 loc) · 190 KB / Copy pathast.cFile metadata and controls6008 lines (5472 loc) · 190 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 /* * This file includes functions to transform a concrete syntax tree (CST) to * an abstract syntax tree (AST). The main function is PyAST_FromNode(). * */ #include "Python.h" #include "Python-ast.h" #include "node.h" #include "ast.h" #include "token.h" #include "pythonrun.h" #include <assert.h> #include <stdbool.h> #define MAXLEVEL 200 /* Max parentheses level */ static int validate_stmts(asdl_seq *); static int validate_exprs(asdl_seq *, expr_context_ty, int); static int validate_nonempty_seq(asdl_seq *, const char *, const char *); static int validate_stmt(stmt_ty); static int validate_expr(expr_ty, expr_context_ty); static int validate_name(PyObject *name) { assert(PyUnicode_Check(name)); static const char * const forbidden[] = { "None", "True", "False", NULL }; for (int i = 0; forbidden[i] != NULL; i++) { if (_PyUnicode_EqualToASCIIString(name, forbidden[i])) { PyErr_Format(PyExc_ValueError, "Name node can't be used with '%s' constant", forbidden[i]); return 0; } } return 1; } static int validate_comprehension(asdl_seq *gens) { Py_ssize_t i; if (!asdl_seq_LEN(gens)) { PyErr_SetString(PyExc_ValueError, "comprehension with no generators"); return 0; } for (i = 0; i < asdl_seq_LEN(gens); i++) { comprehension_ty comp = asdl_seq_GET(gens, i); if (!validate_expr(comp->target, Store) || !validate_expr(comp->iter, Load) || !validate_exprs(comp->ifs, Load, 0)) return 0; } return 1; } static int validate_slice(slice_ty slice) { switch (slice->kind) { case Slice_kind: return (!slice->v.Slice.lower || validate_expr(slice->v.Slice.lower, Load)) && (!slice->v.Slice.upper || validate_expr(slice->v.Slice.upper, Load)) && (!slice->v.Slice.step || validate_expr(slice->v.Slice.step, Load)); case ExtSlice_kind: { Py_ssize_t i; if (!validate_nonempty_seq(slice->v.ExtSlice.dims, "dims", "ExtSlice")) return 0; for (i = 0; i < asdl_seq_LEN(slice->v.ExtSlice.dims); i++) if (!validate_slice(asdl_seq_GET(slice->v.ExtSlice.dims, i))) return 0; return 1; } case Index_kind: return validate_expr(slice->v.Index.value, Load); default: PyErr_SetString(PyExc_SystemError, "unknown slice node"); return 0; } } static int validate_keywords(asdl_seq *keywords) { Py_ssize_t i; for (i = 0; i < asdl_seq_LEN(keywords); i++) if (!validate_expr(((keyword_ty)asdl_seq_GET(keywords, i))->value, Load)) return 0; return 1; } static int validate_args(asdl_seq *args) { Py_ssize_t i; for (i = 0; i < asdl_seq_LEN(args); i++) { arg_ty arg = asdl_seq_GET(args, i); if (arg->annotation && !validate_expr(arg->annotation, Load)) return 0; } return 1; } static const char * expr_context_name(expr_context_ty ctx) { switch (ctx) { case Load: return "Load"; case Store: return "Store"; case Del: return "Del"; case AugLoad: return "AugLoad"; case AugStore: return "AugStore"; case Param: return "Param"; default: Py_UNREACHABLE(); } } static int validate_arguments(arguments_ty args) { if (!validate_args(args->posonlyargs) || !validate_args(args->args)) { return 0; } if (args->vararg && args->vararg->annotation && !validate_expr(args->vararg->annotation, Load)) { return 0; } if (!validate_args(args->kwonlyargs)) return 0; if (args->kwarg && args->kwarg->annotation && !validate_expr(args->kwarg->annotation, Load)) { return 0; } if (asdl_seq_LEN(args->defaults) > asdl_seq_LEN(args->posonlyargs) + asdl_seq_LEN(args->args)) { PyErr_SetString(PyExc_ValueError, "more positional defaults than args on arguments"); return 0; } if (asdl_seq_LEN(args->kw_defaults) != asdl_seq_LEN(args->kwonlyargs)) { PyErr_SetString(PyExc_ValueError, "length of kwonlyargs is not the same as " "kw_defaults on arguments"); return 0; } return validate_exprs(args->defaults, Load, 0) && validate_exprs(args->kw_defaults, Load, 1); } static int validate_constant(PyObject *value) { if (value == Py_None || value == Py_Ellipsis) return 1; if (PyLong_CheckExact(value) || PyFloat_CheckExact(value) || PyComplex_CheckExact(value) || PyBool_Check(value) || PyUnicode_CheckExact(value) || PyBytes_CheckExact(value)) return 1; if (PyTuple_CheckExact(value) || PyFrozenSet_CheckExact(value)) { PyObject *it; it = PyObject_GetIter(value); if (it == NULL) return 0; while (1) { PyObject *item = PyIter_Next(it); if (item == NULL) { if (PyErr_Occurred()) { Py_DECREF(it); return 0; } break; } if (!validate_constant(item)) { Py_DECREF(it); Py_DECREF(item); return 0; } Py_DECREF(item); } Py_DECREF(it); return 1; } return 0; } static int validate_expr(expr_ty exp, expr_context_ty ctx) { int check_ctx = 1; expr_context_ty actual_ctx; /* First check expression context. */ switch (exp->kind) { case Attribute_kind: actual_ctx = exp->v.Attribute.ctx; break; case Subscript_kind: actual_ctx = exp->v.Subscript.ctx; break; case Starred_kind: actual_ctx = exp->v.Starred.ctx; break; case Name_kind: if (!validate_name(exp->v.Name.id)) { return 0; } actual_ctx = exp->v.Name.ctx; break; case List_kind: actual_ctx = exp->v.List.ctx; break; case Tuple_kind: actual_ctx = exp->v.Tuple.ctx; break; default: if (ctx != Load) { PyErr_Format(PyExc_ValueError, "expression which can't be " "assigned to in %s context", expr_context_name(ctx)); return 0; } check_ctx = 0; /* set actual_ctx to prevent gcc warning */ actual_ctx = 0; } if (check_ctx && actual_ctx != ctx) { PyErr_Format(PyExc_ValueError, "expression must have %s context but has %s instead", expr_context_name(ctx), expr_context_name(actual_ctx)); return 0; } /* Now validate expression. */ switch (exp->kind) { case BoolOp_kind: if (asdl_seq_LEN(exp->v.BoolOp.values) < 2) { PyErr_SetString(PyExc_ValueError, "BoolOp with less than 2 values"); return 0; } return validate_exprs(exp->v.BoolOp.values, Load, 0); case BinOp_kind: return validate_expr(exp->v.BinOp.left, Load) && validate_expr(exp->v.BinOp.right, Load); case UnaryOp_kind: return validate_expr(exp->v.UnaryOp.operand, Load); case Lambda_kind: return validate_arguments(exp->v.Lambda.args) && validate_expr(exp->v.Lambda.body, Load); case IfExp_kind: return validate_expr(exp->v.IfExp.test, Load) && validate_expr(exp->v.IfExp.body, Load) && validate_expr(exp->v.IfExp.orelse, Load); case Dict_kind: if (asdl_seq_LEN(exp->v.Dict.keys) != asdl_seq_LEN(exp->v.Dict.values)) { PyErr_SetString(PyExc_ValueError, "Dict doesn't have the same number of keys as values"); return 0; } /* null_ok=1 for keys expressions to allow dict unpacking to work in dict literals, i.e. ``{**{a:b}}`` */ return validate_exprs(exp->v.Dict.keys, Load, /*null_ok=*/ 1) && validate_exprs(exp->v.Dict.values, Load, /*null_ok=*/ 0); case Set_kind: return validate_exprs(exp->v.Set.elts, Load, 0); #define COMP(NAME) \ case NAME ## _kind: \ return validate_comprehension(exp->v.NAME.generators) && \ validate_expr(exp->v.NAME.elt, Load); COMP(ListComp) COMP(SetComp) COMP(GeneratorExp) #undef COMP case DictComp_kind: return validate_comprehension(exp->v.DictComp.generators) && validate_expr(exp->v.DictComp.key, Load) && validate_expr(exp->v.DictComp.value, Load); case Yield_kind: return !exp->v.Yield.value || validate_expr(exp->v.Yield.value, Load); case YieldFrom_kind: return validate_expr(exp->v.YieldFrom.value, Load); case Await_kind: return validate_expr(exp->v.Await.value, Load); case Compare_kind: if (!asdl_seq_LEN(exp->v.Compare.comparators)) { PyErr_SetString(PyExc_ValueError, "Compare with no comparators"); return 0; } if (asdl_seq_LEN(exp->v.Compare.comparators) != asdl_seq_LEN(exp->v.Compare.ops)) { PyErr_SetString(PyExc_ValueError, "Compare has a different number " "of comparators and operands"); return 0; } return validate_exprs(exp->v.Compare.comparators, Load, 0) && validate_expr(exp->v.Compare.left, Load); case Call_kind: return validate_expr(exp->v.Call.func, Load) && validate_exprs(exp->v.Call.args, Load, 0) && validate_keywords(exp->v.Call.keywords); case Constant_kind: if (!validate_constant(exp->v.Constant.value)) { PyErr_Format(PyExc_TypeError, "got an invalid type in Constant: %s", Py_TYPE(exp->v.Constant.value)->tp_name); return 0; } return 1; case JoinedStr_kind: return validate_exprs(exp->v.JoinedStr.values, Load, 0); case FormattedValue_kind: if (validate_expr(exp->v.FormattedValue.value, Load) == 0) return 0; if (exp->v.FormattedValue.format_spec) return validate_expr(exp->v.FormattedValue.format_spec, Load); return 1; case Attribute_kind: return validate_expr(exp->v.Attribute.value, Load); case Subscript_kind: return validate_slice(exp->v.Subscript.slice) && validate_expr(exp->v.Subscript.value, Load); case Starred_kind: return validate_expr(exp->v.Starred.value, ctx); case List_kind: return validate_exprs(exp->v.List.elts, ctx, 0); case Tuple_kind: return validate_exprs(exp->v.Tuple.elts, ctx, 0); case NamedExpr_kind: return validate_expr(exp->v.NamedExpr.value, Load); /* This last case doesn't have any checking. */ case Name_kind: return 1; } PyErr_SetString(PyExc_SystemError, "unexpected expression"); return 0; } static int validate_nonempty_seq(asdl_seq *seq, const char *what, const char *owner) { if (asdl_seq_LEN(seq)) return 1; PyErr_Format(PyExc_ValueError, "empty %s on %s", what, owner); return 0; } static int validate_assignlist(asdl_seq *targets, expr_context_ty ctx) { return validate_nonempty_seq(targets, "targets", ctx == Del ? "Delete" : "Assign") && validate_exprs(targets, ctx, 0); } static int validate_body(asdl_seq *body, const char *owner) { return validate_nonempty_seq(body, "body", owner) && validate_stmts(body); } static int validate_stmt(stmt_ty stmt) { Py_ssize_t i; switch (stmt->kind) { case FunctionDef_kind: return validate_body(stmt->v.FunctionDef.body, "FunctionDef") && validate_arguments(stmt->v.FunctionDef.args) && validate_exprs(stmt->v.FunctionDef.decorator_list, Load, 0) && (!stmt->v.FunctionDef.returns || validate_expr(stmt->v.FunctionDef.returns, Load)); case ClassDef_kind: return validate_body(stmt->v.ClassDef.body, "ClassDef") && validate_exprs(stmt->v.ClassDef.bases, Load, 0) && validate_keywords(stmt->v.ClassDef.keywords) && validate_exprs(stmt->v.ClassDef.decorator_list, Load, 0); case Return_kind: return !stmt->v.Return.value || validate_expr(stmt->v.Return.value, Load); case Delete_kind: return validate_assignlist(stmt->v.Delete.targets, Del); case Assign_kind: return validate_assignlist(stmt->v.Assign.targets, Store) && validate_expr(stmt->v.Assign.value, Load); case AugAssign_kind: return validate_expr(stmt->v.AugAssign.target, Store) && validate_expr(stmt->v.AugAssign.value, Load); case AnnAssign_kind: if (stmt->v.AnnAssign.target->kind != Name_kind && stmt->v.AnnAssign.simple) { PyErr_SetString(PyExc_TypeError, "AnnAssign with simple non-Name target"); return 0; } return validate_expr(stmt->v.AnnAssign.target, Store) && (!stmt->v.AnnAssign.value || validate_expr(stmt->v.AnnAssign.value, Load)) && validate_expr(stmt->v.AnnAssign.annotation, Load); case For_kind: return validate_expr(stmt->v.For.target, Store) && validate_expr(stmt->v.For.iter, Load) && validate_body(stmt->v.For.body, "For") && validate_stmts(stmt->v.For.orelse); case AsyncFor_kind: return validate_expr(stmt->v.AsyncFor.target, Store) && validate_expr(stmt->v.AsyncFor.iter, Load) && validate_body(stmt->v.AsyncFor.body, "AsyncFor") && validate_stmts(stmt->v.AsyncFor.orelse); case While_kind: return validate_expr(stmt->v.While.test, Load) && validate_body(stmt->v.While.body, "While") && validate_stmts(stmt->v.While.orelse); case If_kind: return validate_expr(stmt->v.If.test, Load) && validate_body(stmt->v.If.body, "If") && validate_stmts(stmt->v.If.orelse); case With_kind: if (!validate_nonempty_seq(stmt->v.With.items, "items", "With")) return 0; for (i = 0; i < asdl_seq_LEN(stmt->v.With.items); i++) { withitem_ty item = asdl_seq_GET(stmt->v.With.items, i); if (!validate_expr(item->context_expr, Load) || (item->optional_vars && !validate_expr(item->optional_vars, Store))) return 0; } return validate_body(stmt->v.With.body, "With"); case AsyncWith_kind: if (!validate_nonempty_seq(stmt->v.AsyncWith.items, "items", "AsyncWith")) return 0; for (i = 0; i < asdl_seq_LEN(stmt->v.AsyncWith.items); i++) { withitem_ty item = asdl_seq_GET(stmt->v.AsyncWith.items, i); if (!validate_expr(item->context_expr, Load) || (item->optional_vars && !validate_expr(item->optional_vars, Store))) return 0; } return validate_body(stmt->v.AsyncWith.body, "AsyncWith"); case Raise_kind: if (stmt->v.Raise.exc) { return validate_expr(stmt->v.Raise.exc, Load) && (!stmt->v.Raise.cause || validate_expr(stmt->v.Raise.cause, Load)); } if (stmt->v.Raise.cause) { PyErr_SetString(PyExc_ValueError, "Raise with cause but no exception"); return 0; } return 1; case Try_kind: if (!validate_body(stmt->v.Try.body, "Try")) return 0; if (!asdl_seq_LEN(stmt->v.Try.handlers) && !asdl_seq_LEN(stmt->v.Try.finalbody)) { PyErr_SetString(PyExc_ValueError, "Try has neither except handlers nor finalbody"); return 0; } if (!asdl_seq_LEN(stmt->v.Try.handlers) && asdl_seq_LEN(stmt->v.Try.orelse)) { PyErr_SetString(PyExc_ValueError, "Try has orelse but no except handlers"); return 0; } for (i = 0; i < asdl_seq_LEN(stmt->v.Try.handlers); i++) { excepthandler_ty handler = asdl_seq_GET(stmt->v.Try.handlers, i); if ((handler->v.ExceptHandler.type && !validate_expr(handler->v.ExceptHandler.type, Load)) || !validate_body(handler->v.ExceptHandler.body, "ExceptHandler")) return 0; } return (!asdl_seq_LEN(stmt->v.Try.finalbody) || validate_stmts(stmt->v.Try.finalbody)) && (!asdl_seq_LEN(stmt->v.Try.orelse) || validate_stmts(stmt->v.Try.orelse)); case Assert_kind: return validate_expr(stmt->v.Assert.test, Load) && (!stmt->v.Assert.msg || validate_expr(stmt->v.Assert.msg, Load)); case Import_kind: return validate_nonempty_seq(stmt->v.Import.names, "names", "Import"); case ImportFrom_kind: if (stmt->v.ImportFrom.level < 0) { PyErr_SetString(PyExc_ValueError, "Negative ImportFrom level"); return 0; } return validate_nonempty_seq(stmt->v.ImportFrom.names, "names", "ImportFrom"); case Global_kind: return validate_nonempty_seq(stmt->v.Global.names, "names", "Global"); case Nonlocal_kind: return validate_nonempty_seq(stmt->v.Nonlocal.names, "names", "Nonlocal"); case Expr_kind: return validate_expr(stmt->v.Expr.value, Load); case AsyncFunctionDef_kind: return validate_body(stmt->v.AsyncFunctionDef.body, "AsyncFunctionDef") && validate_arguments(stmt->v.AsyncFunctionDef.args) && validate_exprs(stmt->v.AsyncFunctionDef.decorator_list, Load, 0) && (!stmt->v.AsyncFunctionDef.returns || validate_expr(stmt->v.AsyncFunctionDef.returns, Load)); case Pass_kind: case Break_kind: case Continue_kind: return 1; default: PyErr_SetString(PyExc_SystemError, "unexpected statement"); return 0; } } static int validate_stmts(asdl_seq *seq) { Py_ssize_t i; for (i = 0; i < asdl_seq_LEN(seq); i++) { stmt_ty stmt = asdl_seq_GET(seq, i); if (stmt) { if (!validate_stmt(stmt)) return 0; } else { PyErr_SetString(PyExc_ValueError, "None disallowed in statement list"); return 0; } } return 1; } static int validate_exprs(asdl_seq *exprs, expr_context_ty ctx, int null_ok) { Py_ssize_t i; for (i = 0; i < asdl_seq_LEN(exprs); i++) { expr_ty expr = asdl_seq_GET(exprs, i); if (expr) { if (!validate_expr(expr, ctx)) return 0; } else if (!null_ok) { PyErr_SetString(PyExc_ValueError, "None disallowed in expression list"); return 0; } } return 1; } int PyAST_Validate(mod_ty mod) { int res = 0; switch (mod->kind) { case Module_kind: res = validate_stmts(mod->v.Module.body); break; case Interactive_kind: res = validate_stmts(mod->v.Interactive.body); break; case Expression_kind: res = validate_expr(mod->v.Expression.body, Load); break; case Suite_kind: PyErr_SetString(PyExc_ValueError, "Suite is not valid in the CPython compiler"); break; default: PyErr_SetString(PyExc_SystemError, "impossible module node"); res = 0; break; } return res; } /* This is done here, so defines like "test" don't interfere with AST use above. */ #include "grammar.h" #include "parsetok.h" #include "graminit.h" /* Data structure used internally */ struct compiling { PyArena *c_arena; /* Arena for allocating memory. */ PyObject *c_filename; /* filename */ PyObject *c_normalize; /* Normalization function from unicodedata. */ int c_feature_version; /* Latest minor version of Python for allowed features */ }; static asdl_seq *seq_for_testlist(struct compiling *, const node *); static expr_ty ast_for_expr(struct compiling *, const node *); static stmt_ty ast_for_stmt(struct compiling *, const node *); static asdl_seq *ast_for_suite(struct compiling *c, const node *n); static asdl_seq *ast_for_exprlist(struct compiling *, const node *, expr_context_ty); static expr_ty ast_for_testlist(struct compiling *, const node *); static stmt_ty ast_for_classdef(struct compiling *, const node *, asdl_seq *); static stmt_ty ast_for_with_stmt(struct compiling *, const node *, bool); static stmt_ty ast_for_for_stmt(struct compiling *, const node *, bool); /* Note different signature for ast_for_call */ static expr_ty ast_for_call(struct compiling *, const node *, expr_ty, const node *, const node *, const node *); static PyObject *parsenumber(struct compiling *, const char *); static expr_ty parsestrplus(struct compiling *, const node *n); static void get_last_end_pos(asdl_seq *, int *, int *); #define COMP_GENEXP 0 #define COMP_LISTCOMP 1 #define COMP_SETCOMP 2 static int init_normalization(struct compiling *c) { PyObject *m = PyImport_ImportModuleNoBlock("unicodedata"); if (!m) return 0; c->c_normalize = PyObject_GetAttrString(m, "normalize"); Py_DECREF(m); if (!c->c_normalize) return 0; return 1; } static identifier new_identifier(const char *n, struct compiling *c) { PyObject *id = PyUnicode_DecodeUTF8(n, strlen(n), NULL); if (!id) return NULL; /* PyUnicode_DecodeUTF8 should always return a ready string. */ assert(PyUnicode_IS_READY(id)); /* Check whether there are non-ASCII characters in the identifier; if so, normalize to NFKC. */ if (!PyUnicode_IS_ASCII(id)) { PyObject *id2; _Py_IDENTIFIER(NFKC); if (!c->c_normalize && !init_normalization(c)) { Py_DECREF(id); return NULL; } PyObject *form = _PyUnicode_FromId(&PyId_NFKC); if (form == NULL) { Py_DECREF(id); return NULL; } PyObject *args[2] = {form, id}; id2 = _PyObject_FastCall(c->c_normalize, args, 2); Py_DECREF(id); if (!id2) return NULL; if (!PyUnicode_Check(id2)) { PyErr_Format(PyExc_TypeError, "unicodedata.normalize() must return a string, not " "%.200s", Py_TYPE(id2)->tp_name); Py_DECREF(id2); return NULL; } id = id2; } PyUnicode_InternInPlace(&id); if (PyArena_AddPyObject(c->c_arena, id) < 0) { Py_DECREF(id); return NULL; } return id; } #define NEW_IDENTIFIER(n) new_identifier(STR(n), c) static int ast_error(struct compiling *c, const node *n, const char *errmsg, ...) { PyObject *value, *errstr, *loc, *tmp; va_list va; va_start(va, errmsg); errstr = PyUnicode_FromFormatV(errmsg, va); va_end(va); if (!errstr) { return 0; } loc = PyErr_ProgramTextObject(c->c_filename, LINENO(n)); if (!loc) { Py_INCREF(Py_None); loc = Py_None; } tmp = Py_BuildValue("(OiiN)", c->c_filename, LINENO(n), n->n_col_offset + 1, loc); if (!tmp) { Py_DECREF(errstr); return 0; } value = PyTuple_Pack(2, errstr, tmp); Py_DECREF(errstr); Py_DECREF(tmp); if (value) { PyErr_SetObject(PyExc_SyntaxError, value); Py_DECREF(value); } return 0; } /* num_stmts() returns number of contained statements. Use this routine to determine how big a sequence is needed for the statements in a parse tree. Its raison d'etre is this bit of grammar: stmt: simple_stmt | compound_stmt simple_stmt: small_stmt (';' small_stmt)* [';'] NEWLINE A simple_stmt can contain multiple small_stmt elements joined by semicolons. If the arg is a simple_stmt, the number of small_stmt elements is returned. */ static string new_type_comment(const char *s, struct compiling *c) { PyObject *res = PyUnicode_DecodeUTF8(s, strlen(s), NULL); if (res == NULL) return NULL; if (PyArena_AddPyObject(c->c_arena, res) < 0) { Py_DECREF(res); return NULL; } return res; } #define NEW_TYPE_COMMENT(n) new_type_comment(STR(n), c) static int num_stmts(const node *n) { int i, l; node *ch; switch (TYPE(n)) { case single_input: if (TYPE(CHILD(n, 0)) == NEWLINE) return 0; else return num_stmts(CHILD(n, 0)); case file_input: l = 0; for (i = 0; i < NCH(n); i++) { ch = CHILD(n, i); if (TYPE(ch) == stmt) l += num_stmts(ch); } return l; case stmt: return num_stmts(CHILD(n, 0)); case compound_stmt: return 1; case simple_stmt: return NCH(n) / 2; /* Divide by 2 to remove count of semi-colons */ case suite: case func_body_suite: /* func_body_suite: simple_stmt | NEWLINE [TYPE_COMMENT NEWLINE] INDENT stmt+ DEDENT */ /* suite: simple_stmt | NEWLINE INDENT stmt+ DEDENT */ if (NCH(n) == 1) return num_stmts(CHILD(n, 0)); else { i = 2; l = 0; if (TYPE(CHILD(n, 1)) == TYPE_COMMENT) i += 2; for (; i < (NCH(n) - 1); i++) l += num_stmts(CHILD(n, i)); return l; } default: { char buf[128]; sprintf(buf, "Non-statement found: %d %d", TYPE(n), NCH(n)); Py_FatalError(buf); } } Py_UNREACHABLE(); } /* Transform the CST rooted at node * to the appropriate AST */ mod_ty PyAST_FromNodeObject(const node *n, PyCompilerFlags *flags, PyObject *filename, PyArena *arena) { int i, j, k, num; asdl_seq *stmts = NULL; asdl_seq *type_ignores = NULL; stmt_ty s; node *ch; struct compiling c; mod_ty res = NULL; asdl_seq *argtypes = NULL; expr_ty ret, arg; c.c_arena = arena; /* borrowed reference */ c.c_filename = filename; c.c_normalize = NULL; c.c_feature_version = flags && (flags->cf_flags & PyCF_ONLY_AST) ? flags->cf_feature_version : PY_MINOR_VERSION; if (TYPE(n) == encoding_decl) n = CHILD(n, 0); k = 0; switch (TYPE(n)) { case file_input: stmts = _Py_asdl_seq_new(num_stmts(n), arena); if (!stmts) goto out; for (i = 0; i < NCH(n) - 1; i++) { ch = CHILD(n, i); if (TYPE(ch) == NEWLINE) continue; REQ(ch, stmt); num = num_stmts(ch); if (num == 1) { s = ast_for_stmt(&c, ch); if (!s) goto out; asdl_seq_SET(stmts, k++, s); } else { ch = CHILD(ch, 0); REQ(ch, simple_stmt); for (j = 0; j < num; j++) { s = ast_for_stmt(&c, CHILD(ch, j * 2)); if (!s) goto out; asdl_seq_SET(stmts, k++, s); } } } /* Type ignores are stored under the ENDMARKER in file_input. */ ch = CHILD(n, NCH(n) - 1); REQ(ch, ENDMARKER); num = NCH(ch); type_ignores = _Py_asdl_seq_new(num, arena); if (!type_ignores) goto out; for (i = 0; i < num; i++) { string type_comment = new_type_comment(STR(CHILD(ch, i)), &c); if (!type_comment) goto out; type_ignore_ty ti = TypeIgnore(LINENO(CHILD(ch, i)), type_comment, arena); if (!ti) goto out; asdl_seq_SET(type_ignores, i, ti); } res = Module(stmts, type_ignores, arena); break; case eval_input: { expr_ty testlist_ast; /* XXX Why not comp_for here? */ testlist_ast = ast_for_testlist(&c, CHILD(n, 0)); if (!testlist_ast) goto out; res = Expression(testlist_ast, arena); break; } case single_input: if (TYPE(CHILD(n, 0)) == NEWLINE) { stmts = _Py_asdl_seq_new(1, arena); if (!stmts) goto out; asdl_seq_SET(stmts, 0, Pass(n->n_lineno, n->n_col_offset, n->n_end_lineno, n->n_end_col_offset, arena)); if (!asdl_seq_GET(stmts, 0)) goto out; res = Interactive(stmts, arena); } else { n = CHILD(n, 0); num = num_stmts(n); stmts = _Py_asdl_seq_new(num, arena); if (!stmts) goto out; if (num == 1) { s = ast_for_stmt(&c, n); if (!s) goto out; asdl_seq_SET(stmts, 0, s); } else { /* Only a simple_stmt can contain multiple statements. */ REQ(n, simple_stmt); for (i = 0; i < NCH(n); i += 2) { if (TYPE(CHILD(n, i)) == NEWLINE) break; s = ast_for_stmt(&c, CHILD(n, i)); if (!s) goto out; asdl_seq_SET(stmts, i / 2, s); } } res = Interactive(stmts, arena); } break; case func_type_input: n = CHILD(n, 0); REQ(n, func_type); if (TYPE(CHILD(n, 1)) == typelist) { ch = CHILD(n, 1); /* this is overly permissive -- we don't pay any attention to * stars on the args -- just parse them into an ordered list */ num = 0; for (i = 0; i < NCH(ch); i++) { if (TYPE(CHILD(ch, i)) == test) { num++; } } argtypes = _Py_asdl_seq_new(num, arena); if (!argtypes) goto out; j = 0; for (i = 0; i < NCH(ch); i++) { if (TYPE(CHILD(ch, i)) == test) { arg = ast_for_expr(&c, CHILD(ch, i)); if (!arg) goto out; asdl_seq_SET(argtypes, j++, arg); } } } else { argtypes = _Py_asdl_seq_new(0, arena); if (!argtypes) goto out; } ret = ast_for_expr(&c, CHILD(n, NCH(n) - 1)); if (!ret) goto out; res = FunctionType(argtypes, ret, arena); break; default: PyErr_Format(PyExc_SystemError, "invalid node %d for PyAST_FromNode", TYPE(n)); goto out; } out: if (c.c_normalize) { Py_DECREF(c.c_normalize); } return res; } mod_ty PyAST_FromNode(const node *n, PyCompilerFlags *flags, const char *filename_str, PyArena *arena) { mod_ty mod; PyObject *filename; filename = PyUnicode_DecodeFSDefault(filename_str); if (filename == NULL) return NULL; mod = PyAST_FromNodeObject(n, flags, filename, arena); Py_DECREF(filename); return mod; } /* Return the AST repr. of the operator represented as syntax (|, ^, etc.) */ static operator_ty get_operator(struct compiling *c, const node *n) { switch (TYPE(n)) { case VBAR: return BitOr; case CIRCUMFLEX: return BitXor; case AMPER: return BitAnd; case LEFTSHIFT: return LShift; case RIGHTSHIFT: return RShift; |
| You are visitor 01402503 — GeezerVison does not store the pages you look up. Best viewed with Netscape Navigator 4.7 or Internet Explorer 6 at 800×600. No cookies required. |